<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script>
			var _aaa;
			document.write(typeof(_aaa)+'<br/>');
			
			var $bbb  = '123123';
			document.write(typeof($bbb)+'<br/>');
			
			var $ccc = 1231.0000;
			document.write(typeof($ccc)+'<br/>');
			
			var bool = true;
			document.write(typeof(bool)+'<br/>');
			
			var aaaaa = null;
			document.write(aaaaa);
			
			var obj = new Object();
			document.write(obj+'<br/>');
			
			var num = '0x75';
			document.write(isNaN(num));
			
//			document.write(' 换行');
			
			var obj1 = new Object('奥术大师多');
		</script>
	</head>
	<body>
	</body>
</html>
